Alarm device for indicating high and low liquid level



" Feb. 8. 1927.

1 1,617,101 A. B L ITLER ALARM DEVICE Fcin INDICATING men mp 1.6 LIQUID LEVEL 7 p 7 I Filed April /1924 I I rluven'roa."

ARTHUR, 5 U R ATTO RNEYT Patented Feb. 8, i I

; imam BUTLEB, or wmroae, ENGLAND, risers-Noe Tb semen TiRiSi'i mammary,

' iMI'rEn-oFtoianoN,ENGLAND."

Arnltlvrnnv'ronaron innroarl'ne Breanne Low "rirouin LiivEit.

I A'pplica'tion filed. April.25, 1924, Seriial'No; 709,068, and in Great Britain April 26, 1923. i i

This invention relates to improvements in alarm devices for ind cating high and low liquid level and has for one of its objects a construction whereby all the partsof the device are accessible and are disposed outside of the container having the liquid therein, a further object being the provision of simple means whereby greater accuracy of opera.-

tion, more compactness of construction and increased rellabllity of performance over a wider range of pressures i'sobtained as compared with known devices of like character. The mvention consistsin' the arrangement in combination of a chamber connected with of the liquid in the chamberfis in theplane.

the container for the liquidsojthat the level of the level of the liquid in the container (lllllllg OPBl'tillOIl, a cover for said chamber, a

centrally arranged depending hollow mem.-

ber mounted on said cover, a stem within said member, a bucket float arranged symmetrically aboutthe exterior of saidmemjher, togglelevers pivotally mounted in said member and connected to said fioat,'armson said toggle levers for transmitting the movement of the float to the stem, a rod within said member, levers pivotally mounted on the lower part of said member and engaging with said rod to transmit the movement of said rod to said float, abucket float on said rod and means for externally I indicating movements of the stemto produce a high and low liquid level alarm device.

Referring to the drawings, 1 which part ofthis specification,- V

Figure 1 is a longitudinal section through an apparatusconstructed in accordance withthis invention.v r

Figure 2 is a longitudinal sectlon through the apparatus shown in Figure 1 ,and istaken on the line 2-2 of that figure. 7

Figures 3, 4L and 5 are diagrammatic views illustrating the operation: of the apparatus The chamber a, for the mechanism is lo- I cated in suitable. relation to the normal is under observation, is under pressure in the container such for example as is usualun steam boilers and the like.

The space above the liquid in the container is connected to the space above the form.

' be readily effected between the cap 9; and

with a cover e d dependingtherefrom into the chamber a',

said membercl'being supported in said cover 6 by means of the screwed collar 0? which is 1 located inthe recess e of the'cover'e. V

The cover e'ha's an upwardly extending hollow extension upon'its uppersurface, said hollow extension f being coaxial. with thehollow ,memberyd,'andto gensure such coaxial arrangement being positively maintainedat all times the extension f has' a spigot f for engagement with the bore of the member ;The extension is fitted with a cap githe internal surfaces of which are so formed as to receive a seating element h and clamp said seating element 7b in place upon the end of theextension f when the parts areassembled- To dispose the element It so that the axis of itsbore shall be accurately. located relative'to the axis of the extension ,f the'ele-v menth is provided withfa spigoth. .Iwhjich engages with a recess 7 formed in the upper end of the extension i i In-order that a pressure tightjoint may the extension f a looking or jointing nut g is provided. I j.-

.' The member cl at its lower end is provided pair ofthe arms d supportfalever 'i'which is'pivoted at in said arms. The levers 72 have 'antifriction rollers Z and m at their respective extremities for purposes herein after to be more fully explained. i -A stem 0 is located within the extension 7' and passes, into thebore of the member d for a certain distance. The stem 0 has a jvalve face n at'its upper end for coaction with the valve seat k formed inthe-element h as illustrated'while the l'ower end'of the" 'withtwo pairs of projecting arms d yeach said stemo is connected to the arm gfofthe toggle levers r pivoted at p in themember' 01, slots p being formed in'thefmember al to allow. the saidarms 9 to pass therethrou'gh. Bifurcated toggle links 8 are pivotally.

"connected to thefree ends of thetoggle levers r and connect said toggle levers r to the bucket float w; by this arrangement the stemI To is constrained tomove in: opposite direction to the bucket float 90 when said float w. is longitudinally displaced.

A rod 2 is fitted with a collar 4) for engagement with the rollers m and also with the bucket float 10 which is supported in position t by the pin t and washer t the upper end of the rod t having a guiding device to for cooperation with the member OZ.

A second bucket float x is disposed about the member at above the projecting arms 03 thereof, the lower part of said float as being arranged to engage with the rollers Z of-the levers 2'.

The pressure employed to operate anaudible signal represented in the drawings by a whistle y. The whistle y is mounted on the cap gand supplied"withflfiuidV pressure through the passage 2.

The device as a whole operates to' give an alarm whenever the level changes more than a predetermined amountregardless of the nature of said change, that is to say,

the alarm given irrespective of whether "the level of the liquid rises ortalls.

Figure 3 illustrates the position of the buckets 'w and 00 when the level of the liquid is at a predetermined height; both the buckets w and w are full of liquid, the force due to the efiecti've imniersedweight ofthe bucket to being balanced by a part of the force exertedby theffioat ac and its contents through the levers stances it will be seen that the valve 12. is

Under these circum maintained against its seat if by the remaining part of the force exerted by the float x and its contents through the bifurcated toggle links 3, toggle levers 1*, arms Q and stem 0.

fFigure t illust'at'es the position of the buckets w and 00 when the level ot the liquid effective weight has been reduced by the partial immersion of the Heat 0 in the rising liquid. Under these circumstances the float mrises and withdraws the valve a from oil" its seat 7L2 throughthe intermedt ationof the links 8, levers 7', arms 9 and stem ow1th the result that filllCl pressure passes through thepassage .e -to the whistle 3/ which is operated thereby to give an audible alarm.

Figure 5 illustrates the positionv of the buckets w and 90 when the level of th'e liquid within the chamber a is of the float w and its contents as the efldective weight of the bucket '10 has been increased owing to the level of the liquid having fallen. Under these circumstances the float r0 rises and withdraws the valve 72, from 0%? its seat 72. through the intermediation of the links 3, levers 1, arms 9 and stem 0 with the result that fluid pressure passes through the passage 3 to the whistle g which is again operated thereby t-otgive an audible alarm.

71 claim:

1. A high and low'liquid level alarm device having in combination a chamber connected with the container for the, liquid so that the level of the liquid in the chamber in the plane of the level of the liquid in the container duringoperation, a-cover for,

said chamber a centrally arranged depend ing hollow member mounted on'said cover, a stem withinsaid' member, a hucketiloat arranged symmetrically about the exterior of said member, toggle levers .pivotally mounted in said member and connected to 7 said float, arms on said toggle levers for transmltting the movement of the float to the stem, a rod within said member, levers pivotally mounted on the lower part of ,stem.

2. In a hlgh and low llquid level alarm device as claimed in claim 1 the arrangement of rollers on the ends of the levers for transmitting the movement ofthe rod to the first named float and means associated with the hollow member for guiding the movement of the rod. I r 1 3. Ina high and low liquid level al'arn'i device as claimed in claini'l the arrangement 0:1 a valve face on the upper end of the stem, a valve seating torcooperation with said face, a hollow extension mounted on said cover for supporting said seating and enclosing said stem, a cap for retaining said seating in position, a signal device mounted on said cap for operation by thepressure in the chamber when the valve 'iiaee recedes from the seating, rol ers on the ends of the levers for transn'iitting the movementoi the rod to .In testimony 'whereof I have signed my name to this specification.

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